International Journal of Tropical Insect Science

, Volume 6, Issue 6, pp 677–679 | Cite as

Larval Instars Determination for Chilo partellus Swinhoe (Lepidoptera: Pyralidae) Reared on Sorghum

  • Aliyageen M. Alghali


Larval instars of Chilo partellus Swinhoe reared on sorghum plants were determined. The larvae were separable into five non-overlapping instars by analysis of variance and Duncan’s multiple range test, frequency distribution and scatter diagram of the head capsule widths. Head capsule increment from one instar to the next conformed to Dyar’s rule, while at the same time agreeing with Richards’ hypothesis. The stadial periods for the five instars were 6, 4, 5, 3 and 7 days, respectively.

Key Words

Chilo partellus larval instars sorghum head capsule width 


Les phases morphologiques larvaires du Chilo partellus Swinhoe élevé sur des plantes de sorgho étaient déterminées. Les larves étaient séparées en cinq phases distinctes par analyse de la variance. Le test de champ multiple de Duncan. La distribution de fréquence et le diagramme de distribution des largeurs des têtes. Les augmentations de largeurs des têtes d’une phase à la phase suivante se conformaient à la loi de Dyar, et satisfaisaient aussi l’hypothèse de Richards. Les périodes de sifférentes phases étaient de 6, 4, 5, 3 et 7 jours, respectivement.

Mots Cléfs

Chilo partellus phases larvaires sorgho largeur de tête capoulaire 


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Copyright information

© ICIPE 1985

Authors and Affiliations

  • Aliyageen M. Alghali
    • 1
  1. 1.International Centre of Insect Physiology and Ecology (ICIPE)MbitaKenya

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